Beach is defined as a coast composed of cohesionless materials such as sand and gravel. The beach is exposed to the longshore currents caused by the breaking waves. Longshore currents cause longshore sand transport. On natural beach, the longshore sand transport is usually in equilibrium. However, longshore sand transport is interrupted by coastal structures such as breakwater, seawalls, harbors, etc. As a result, sand will deposit on the updrift side of structure and erosion will occur on the downdrift side. In this study, the effects of coastal currents formed by wind ripples on the shoreline were observed depending on the time and the accumulation in the breakwater structure was estimated with an analytical method. 1 year of coastal change estimated by analytical method, compared with observations, the correlation between them was found to be 0,99. On the other hand, the wave break depth is found to be 3,67 m. and the breakwater length corresponding to the wave break depth is found to be 512,38 m. It is estimated that 512,38 meters of the breakwater in 254,5 years will be filled with sediment.
Longshore Sand Transport, Shoreline, Coastal Structures, Waves